[Webkit-unassigned] [Bug 200776] New: IntersectionObserverEntry#intersectionRatio can be larger than 1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200776

            Bug ID: 200776
           Summary: IntersectionObserverEntry#intersectionRatio can be
                    larger than 1
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: timdream at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 376398

  --> https://bugs.webkit.org/attachment.cgi?id=376398&action=review

test case

STR: Load the minimal test case. the callback will put the intersectionRatio on the page.

Expected: The intersectionRatio should be exactly 1 in this case because the element is entirely in the viewport.

Actual: It's 1.0270270109176636.

The spec states it should be a number between 0 and 1. https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-intersectionratio

This is also reproducible on Chrome but not Firefox.

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